Adjusting attachment for telephone signal-bells



(No Model.)

C. F. DUN'DERDALE.

ADJUSTING ATTACHMENT FOR TELEPHONE SIGNAL BELLS.

No. 553,977. Patented Feb. 4, 1896.

ANDREW lGRMMI'L PHOTO-III'KQWASNINGTDN. 0.6.

UNirE STATES ATENT OFFICE,

CLEAVELAND F. DUNDERDALE, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE AUTOMATIC LONG DISTANCE TELEPHONE COMPANY OF CHICAGO, ILLS.,

OF ILLINOIS.

ADJUSTING ATTACHMENT FOR TELEPHONE SIGNAL-BELLS.

SPECIFICATION forming part of Letters Patent No. 553,977, dated February 4:, 1896. Application filed June 27, 1895- Slifil N0. 554,215. (N0 model.)

To all whom it may concern:

Be it known that I, CLEAVELAND F. DUN- DERDALE, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Adjusting Attachments for Telephone Signal Bells, of which the following is a specification.

My invention relates to certain improvements in electromagnetically-operated bells employed for signaling in telephonic apparatus, and has more particular reference to the means whereby the proper positioning of the gongs of the bell may be effected relative to striker of the bell.

My invention has for its object the provision of an attachment which may be placed upon the telephone-box and arranged and constructed in such a manner as to be capable of positioning the gongs relative to the striker by convenient manipulation and which when the proper adjustment is effected the attachment as a whole may then be permanently secured and serve to hold the gongs firmly in their adjusted position relatively to the bellstriker.

My invention consists in an attachment comprising a two-part holding member each of the two parts of which is adapted to be disposed and overlap the one upon the other and held in this position upon the telephone-box, each one of the parts of the said holding mem ber also carrying and holding a gong of the bell and the overlapping portions of each part being capable of lateral movement the one upon the other to thereby position the gongs at proper relative distances from the bellstriker, which vibrates between said gongs.

My invention consists in certain other features which will be particularly described and pointed out in my claim, reference being now had to the accompanying drawings,in which Figure 1 is a sectional view of the top portion of a telephone-box and of the attachment for the bell. Fig. 2 is a plan View of the attachment, the gongs of the bell being shown in dotted lines. Fig. 3 is a detail .per-

spective view of the two-part holding member. The telephone-box is designated at A and and holding the bell-gongs J and J.

the eleotromagnets of'the ordinary and usual character at B.

The bell-striker D is disposed between the electromagnets and actuated vibratorily in the usual manner common to electric telephone-bells.

The holding member E is composed of the two separate parts or elements E and E", which are disposed and overlap the one upon the other and are temporarily and slidably held in this position by means of the screws a a, which, extending through the longitudinally-coincident slots 1) and d in each of the parts E and E enter the wood of the telephone-box A. The parts E and E are also each provided with an opening H, which openings coincide longitudinally when the parts are positioned the one overlapping upon the other, and which, as previouslystated, is likewise the case with the slots 1) and d. The striker D vibrates freely within these openings H. Rigidly secured respectively to the parts E and E are the posts J and J carrying and The ends of slots (Z on each of the parts E and are open, so that said parts may slide into overlapping position and be removed without encountering an obstacle in the bell-striker.

The screws K and K serve to secure the holding member E permanently in position, but are not placed until the proper adjustment is effected.

In order to adjust the gongs J and J in their proper position relative to the striker D it is simply necessary to slide the two parts E and E in either direction, as may be required, which carries the gongs J and J 2 to ward or away from the stationary striker D, and on each lateral movement testing the sound of the gongs by the striker, until the proper distancing and desired sound is produced, the screws 1) and d holding the two parts E and E in proper relation on the box during this operation, but permitting a free lateral movement of said parts to effect the adjustment aforesaid. \Vhen the proper relative position of the parts E and E and the gongs J and J 2 is obtained the holding member E is permanently secured by the screws K and K and said parts withheld securely gongs, said separateparts being capable of from any movement whatever, thus maintainq lateral sliding movements carrying the gong's ing' the gongs J and J permanently in their toward or away from the striker in order to proper adjusted relation to the striker D. effect the proper adjustment and means for Having thus described my invention, What holdin the two separable parts permanently I claim as new therein, and desire to secure upon the telephone-box and thusmaintain the by Letters Patent, is bell-gongs securely and immovably in an ad- An adjusting attachment for telephone sigjusted position relative to the bell-striker. nal-bells consisting of a holding member com- In testimony whereof I affix my signature prised of two separable parts, overlapping in presence of two witnesses. each other and slidably held upon the tele- CLEAVELAND F. DUND'ERDALE. phone-box until the proper adjustment is cilected, bell-gongs held and carried by said separate parts, a bell-striker between said i lVirnesses:

CHAS. C. BULKLEY, L. W. BULKLEY. 

